Solve by factorization
2x^2 + 3x -20 = 0
2 answers:
Answer:
x=2.5 or x=-4
Step-by-step explanation:
factorisation= factors:1, 2, 4, 5, 10, 20 (only the positive factors)
We will use the factors 4 and 5.
=(2x-5)(x+4)=0
2x-5=0 || x+4=0
2x=+5 || x=-4
x=2.5 or x=-4
Answer:
x = 5/2, -4.
Step-by-step explanation:
2x^2 + 3x - 20
NOTE: 2 * -20 = -40 so we need 2 numbers whose product is - 40 and whose sum is + 3. These are + 8 and -5, so we write
= 2x^2 + 8x - 5x - 20 Factor by grouping:
= 2x(x + 4) - 5(x + 4)
= (2x - 5)(x + 4)
so x = 5/2, -4 are the roots.
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